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Leenen LP, Schoon E, Stuifbergen W, van der Werken C.Leenen LP, et al.Ned Tijdschr Geneeskd. 1991 Jun 1;135(22):992-6.Ned Tijdschr Geneeskd. 1991.PMID: 2062396Dutch.
Leenen LP, van der Werken C, Sanders W.Leenen LP, et al.Ned Tijdschr Geneeskd. 1990 Aug 25;134(34):1651-3.Ned Tijdschr Geneeskd. 1990.PMID: 2215708Dutch.
Holtslag HR, van Beeck EF, Lichtveld RA, Leenen LP, Lindeman E, van der Werken C.Holtslag HR, et al. Among authors: leenen lp.Bull World Health Organ. 2008 Feb;86(2):111-7. doi: 10.2471/blt.06.033803.Bull World Health Organ. 2008.PMID: 18297165Free PMC article.